What will be the weather in last of December for camping overnight?
— As of now there is fresh light snow fall in Dhauladhars, so you can expect a cold weather in Triund Hill.
2. Do I need a guide for the mentioned Itinerary?
No if you start early in the morning say around 8AM then you’ll reach Triund by 12 noon and may come across some fellow trekkers plus there are two shops ahead Dharamkot one in Gallu Devi and second one is Magic View Café and here you’ll find people who will be always happy to help. Most people go to Triund on their own without guide….and if you asked anyone in Dharamkot for route they’ll tell you. But then it’s your choice to hire guide.
But up to Triund and Snowline café you don’t need any. Just be careful and try and walk in the inner sides of the trails for own safety and never forget to inform your family and friends about your trekking plans.
3. What kind of gear/equipment I should carry (especially for illaqa)?
All you need is good warm jacket, gloves if you like, cap, woolen socks, and good shoe with grip and sun protection cream for face. As of Ilaka that is the Glacier point most of trekkers avoid it during Dec end to March (except professional trekkers)….because of heavy snow fall in Dhauladhars. It would be good if you restrict your trail up to Triund or still if you like to go further and if there is mild snow in Triund then you can try up to SnowLine café…at a distance of about 3km from Triund (there is no guarantee of café being open in December end due to cold weather). But if you like to stay in Triund for a night or more you better check this link providing info advance booking of Guest House of Forest Department in Triund http://www.triundhill.com/triund-guest-house
You don’t need to carry any sleeping bag if you can get a room in guest house…..in Triund there are two tea shop and they have some tents and charge about 300/- INR for each tent with 3 sleeping Bags and mattresses. But Guest House is good option in December….something better than tents.
4. What is the tourist traffic in that time?
Traffic is LOW due to cold weather but there are some who dare to enjoy cold weathers.